If x2 + y2 4x 4y + 8 = 0, then the value of x y is

1.	If x² + y² 4x 4y + 8 = 0, then the value of x y is
A.	4
B.	4
C.	0
D.	8
Answer» D. 8

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If x2 + y2 4x 4y + 8 = 0, then the value of x y is

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If x² + y² 4x 4y + 8 = 0, then the value of x y is